What's better for a defret?

Thinking of getting one of my basses defretted. There are two somewhat local luthiers/techs (one quite famous the other not so much but has 30 years of experience). The prices are comparable.

One uses maple wood to fill the slots and the other uses some sort of plastic compound. One says he prefers the wood (maple) as it ages well. The other likes plastic because it isn't affected by the seasons.

So...what do you think? BTW, the neck is ebony, if that makes any difference.

"For a lined fretless, we inlay maple fretlines for our lined fretless basses. If you want a lower contrast wood for the lines, we suggest koa. Lots of other companies use plastic for fretlines, but you wind up with little fret-like ridges as the wood shrinks and the plastic doesnt."http://www.alembic.com/info/custom_options.html

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"For a lined fretless, we inlay maple fretlines for our lined fretless basses. If you want a lower contrast wood for the lines, we suggest koa. Lots of other companies use plastic for fretlines, but you wind up with little fret-like ridges as the wood shrinks and the plastic doesnt."http://www.alembic.com/info/custom_options.html